51单片机内部RAM分配图示

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1、片内RAM128B存储单元内容解析FFH...寄存器BF0HB...累加器AE0HACC...程序状态字D0HPSWCFHCEH定时器/计数器2（高字节）CDH﹡TH2定时器/计数器2（低字节）CCH﹡TL2定时器/计数器2自动再装载时间常数（高字节）CBH﹡RLDH定时器/计数器2自动再装载时间常数（低字节）CAH﹡RLDLC9HC8H﹡T2CON...中断优先控制B8HIP...P3口锁存器B0HP3...允许中断控制A8HIE...P2口锁存器A0HP2...3片内RAM128B存储单元内容解析串行数据缓冲器99HSBUF串行控制98HSCON...P1口锁存器90HP18FH8EH定时

2、器/计时器1，时间常数（高字节）8DHTH1定时器/计时器0，时间常数（高字节）8CHTH0定时器/计时器1，时间常数（低字节）8BHTL1定时器/计时器0，时间常数（低字节）8AHTL0定时器/计时器方式控制89HTMOD定时器/计时器控制88HTCON电源控制及波特率选择寄存器87HPCON86H85H84H数据地址指针，16位（DPH,DPL）83HDPTR82H堆栈指针81HSPP0口锁存器80HP07FH用户数据区......30H7FH7EH7DH7CH7BH7AH79H78H2FH位寻址3片内RAM128B存储单元内容解析区77H76H75H74H73H72H71H70H2EH6

3、FH6EH6DH6CH6BH6AH69H68H2DH67H66H65H64H63H62H61H60H2CH5FH5EH5DH5CH5BH5AH59H58H2BH57H56H55H54H53H52H51H50H2AH4FH4EH4DH4CH4BH4AH49H48H29H47H46H45H44H43H42H41H40H28H3FH3EH3DH3CH3BH3AH39H38H27H37H36H35H24H33H32H31H30H26H2FH2EH2DH2CH2BH2AH29H28H25H27H26H25H24H23H22H21H20H24H1FH1EH1DH1CH1BH1AH19H18H23H17H1

4、6H15H14H13H12H11H10H22H0FH0EH0DH0CH0BH0AH09H08H21H07H06H05H04H03H02H01H00H20H1FH(R7)工作寄存器区31EH(R6)1DH(R5)1CH(R4)1BH(R3)1AH(R2)19H(R1)18H(R0)17H(R7)工作寄存器区216H(R6)15H(R5)14H(R4)13H(R3)12H(R2)11H(R1)10H(R0)0FH(R7)工作寄存器区10EH(R6)0DH(R5)0CH(R4)0BH(R3)0AH(R2)09H(R1)08H(R0)07H(R7)工作寄存器区006H(R6)05H(R5)04H(R4

5、)03H(R3)02H(R2)01H(R1)00H(R0)3